code: def test_dominates_1d_equal(
      v: float, direction: StudyDirection
  ) -> None:
      assert not _dominates(
          create_trial(values=[v]),
          create_trial(values=[v]),
          [direction],
      )
  
file_path: optuna/tests/study_tests/test_multi_objective.py
imports: import pytest
  from optuna.study import StudyDirection
  from optuna.study._multi_objective import _dominates
  from optuna.trial import create_trial
  from optuna.trial import TrialState
label_desc: Use image node_id 2 for calling a global function with example usage: test_dominates_1d_equal(v, direction) without return types